Pulp stock agitating apparatus



Nov. '1, 1938. J. A. ROSMAIT PULP 'STOCK AGITATING APPARATUS Filed May11, 1936 7' INVENTOR. c/Ofi/i A. fiosmait ATTORNEY5.

Patented Nov. 1,. 1938 UNITED STATES PATENT'OFFICE 2.135.201 PULP s'rocxAGIT'ATING maaa'rus John A. Roslhait, Manistee, men.

Application May 11, 1938, Serial No. 78,969

Claims. (01. 92-37) My invention relates to improvements in pulp stockagitating apparatus.

Pulp stock is largely water. The .pulp wood fibers are carried in thewater. In storing the 5 stock prior to its fabrication into paper it isdesirable to maintain a constant and uniform consistency of the pulp,stock in order that when withdrawn from storage for paper fabricationit will be of a uniform character.

An object of my invention is to provide improved apparatus including thepulp storage chest or tank for agitating the pulp stock whereby thedispersion of the pulp wo fibers through the liquid will be kept uniformconstant. I

Another object is to provide improved apparatus of the character setforth which is readily applicable without appreciable reconstruction toexisting pulp storage tanks or chests.

A meritorious feature of my improved apparatus is the embodiment thereinof means adapted to de-a'erate the pulp stock to facilitate itsrecirculation by the pump.

In the recirculation of pulp stock by the pump through the storage chestit frequently happens 5 that considerable air is entrained in the stockand this air interferes with the functioning of the pump. Improved meansis here provided for de-aerating the pulp stock during its passagethrough the tank and for minimizing the tend- :m ency ,to' entrain airupon its discharge from the pump into the tank during its recirculation.

, The above objects and others together with various meritoriousfeatures and advantages will more fully appear from the followingdescription,

- appended claims, and accompanying drawing,

wherein:

,The figure of the drawing illustrates a sectional view through a pulpstock storage tank of the vertical type wherein the pump to ether withits intake and outlet is shown in elevation.

In the drawing the pulp stock storage chest or tank is indicated as "I.It may be formed of concrete or other material suitable for the purpose.It is provided with a downwardly slopingsuperlmpose the tank and areprovided with out-.-

lets 20 leading thereinto. Outlet '2! from one as beater chest is hereshown as leading into the outlet of the pump mechanism hereinafterdescribed. The top of the chest may be provided with a manhole 22 fittedwith a cover and provided for the purpose of washing out the chest.

To accomplish recirculation of the pulp stock 5 and maintain its uniformconsistency while in. storage in the chest I provide a pump 24 which maybe suitably driven by motor 26. This pump has an intake 28 terminatingin an inverted end paper or an additional pump may be provided towithdraw pulp stock from the chest for use 20 in the manufacture ofpaper, which additional pump might communicate directly with theinterior of the chest or through the pump discharge 32. My inventionresides. inv the structure which has to do with the agitation of thepulp stock within the chest and its re-circulation therethrough and themaintenance of a uniform consistency thereof rather than to the forwardmovement of the pulp stock from the chest to another unit in the system.30

The pump has an outlet 32 which terminates in a horizontally extendingportion of increasing diameter 34. This flaring outlet is disposed todischarge into the upper portion of the tank sub stantially at thecenter thereof. Additional 35 heaters not shown might communicate withthis flaring outlet as at 36.

Surmounting the sump and pump intake is a dome-shaped baiile 38 heldspaced above the floor of the tank by supports 40. This baiiie extends40 outwardly toward the wall of the tank so that the pulp stock flowsthereover and underneath the margin thereof to the pump intake. The pulpstock moving downwardly through the tank is directed outwardly towardthe side wall thereof on all sides so that the formation of dead spotswithin the tank at the juncture of the side wall and floor is preventedand a constant uniform movement of the pulp stock is produced. Thebaille is provided with a pulp aperture 42 at its apex through whichpulp stock or water may' be caused to flow to prevent the clogging up ofthe material underneath the baiiie.

Surmounting the dome-shaped baflle is a vertical standpipe 44 which isprovided with a bot- 5'6 the, discharge outlet for the pump.

standpipe and the pulp stock flows out through the apertures 50 inthestandpipe or overflows the top of the standpipe and flowsdown the sidesof the standpipe. The pulp stock is withdrawn by the pump intake afterit has passed over the bailie and underneath the margin thereof into thesump ll.

The discharge of the pulp stock into and through the standpipe producesa de-aeration of the stock as the air bubbles arise along the surface ofthe standpipe and discharge through the top of the pulp stock. Thedischarge oi the pulp stock into the standpipe itself also tends tominimize the tendency to entrain any subnr stantial quantity of air asis the case with its discharge directly into the top 0! a tank having arelatively large surface area. The outflow of pulp stock through theapertures II in the standpipe alsoproduces a de-aeratiqn oi the stock.With this type oi! a structure the de-aeration is carried forwardly tothe point that the pump will function effectively at all times for amaximum discharge as desired. The tie-aeration is continued by the flowof pulp stock over the baille and the outflow of pulp stock from thestandpipe in all directions toward the side wall of the tank and itsflow outwardly over the baiiie toward the side wall oi the tank producesa uniti l form and homogeneous mixture the constant uniiorm character ofwhich is maintained by the circulation through the tank.

What I claim:

1. In pulp agitating apparatus, a pulp storage tank, a standpipesupported within the tank and provided with a plurality of aperturesthrough its wall adapted to discharge the contents of the standpipetherethrough into the tank, a pump having its intake communicating withthe bottom of the tank and having its outlet adapted to discharge intothe top of said standpipe, an upwardly convex baiiie surmounting saidpump intake spaced above the floor of the tank at its margin andprovided at its apex with an inlet aperture disposed underneath thelowerend of the standpipe but 0! less diameter than the interior diameter ofthe standpipe, said standpipe supported with its lower end spaced abovesaid inlet aperture through the baiiie and with its upper end positionedadjacent to the top of the tank. 7

2. In pull agitating apparatus, a pulp storage tank, a standpipesupported within the tank and provided with a plurality of aperturesthrough its wall adapted to discharge the contents of the standpipe intothe tank, said standpipe spaced above the floor of the tank and having askirt flaring downwardly and outwardly from below said standpipe andextending outwardly toward the wail of the tank on all sidessubstantially beyond the standpipe and adapted to direct the contents ofthe standpipe discharged through said outlets toward the side wall oithe tank, said shield spaced at its margin above the floor. ot the tank,a pump having its intake communicating with the interior of the tankbelow said shield and having its outlet discharging into the top of thestandpipe.

4. In pulp agitating apparatus, a pulp storage tank having a sump in itsfloor, a pump having its intake communicating with said sump. adome-shaped baflle surmounting in spaced relationship said sump and pumpintake and'extending downwardly and outwardly toward the side wall ofthe tank, a standpipe supported by and extending upwardly from the apexof the bail 1e and provided with a plurality of apertures through itswall to discharge the contents of the standpipe into the tank above saidbaflle, saidpump having its outlet discharging into the upper end of thestandpipe.

5. In pulp agitating apparatus, a pulp storage tank having a floorsloping on all sides toward its center,.a pump having its intakeadjacent to the center oi the floor of the tank, a dome-shaped baillesurmounting the pump intake and the floor of the tank adjacent theretoand flaring downwardly and outwardly from its apex toward the side wallof the tank on all sides, said baiile spaced on its margin above thefloor of the tank and having outlets through its apex to admit pulptherethrough to the space underneath said baifle, a standpipe extendingupwardly from the apex of the baiiie to approximately the top of thetank and having its bottom spaced above said baflie and having its sidewall provided with a plurality oi apertures for the discharge or itscontents into the tank, said pump having its outlet discharging into thetop of said standpipe.

JOHN A. ROSMAIT.

